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DocumentWood transcriptome profiling identifies critical pathway genes of secondary wall biosynthesis and novel regulators for vascular cambium development in populus
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Wood, the most abundant biomass on Earth, is composed of secondary xylem differentiated from vascular cambium. However, the underlying molecular mechanisms of wood formation remain largely unclear. To gain insight into wood formation, we performed a series of wood-forming tissue-specific transcriptome analyses from a hybrid poplar (Populus alba × P. glandulosa, clone BH) using RNA-seq. Together with shoot apex and leaf tissue, cambium and xylem tissues were isolated from vertical stem segments representing a gradient of secondary growth developmental stages (i.e., immature, intermediate, and mature stem). In a comparative transcriptome analysis of the ‘developing xylem’ and ‘leaf’ tissue, we could identify critical players catalyzing each biosynthetic step of secondary wall components (e.g., cellulose, xylan, and lignin). Several candidate genes involved in the initiation of vascular cambium formation were found via a co-expression network analysis using abundantly expressed genes in the ‘intermediate stem-derived cambium’ tissue. We found that transgenic Arabidopsis plants overexpressing the PtrHAM4-1, a GRAS family transcription factor, resulted in a significant increase of vascular cambium development. This phenotype was successfully reproduced in the transgenic poplars overexpressing the PtrHAM4-1. Taken together, our results may serve as a springboard for further research to unravel the molecular mechanism of wood formation, one of the most important biological processes on this planet. Keywords: Genetic resources, Research ID: 3622616 -
DocumentImprovement of reclaimed soil for sustainable wood energy forest and analysis of growth inhibitory factors by growing season of Populus euramericana
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.In this study, the effect of soil amendment and ferilization on soil physicochemical properties and tree growth(Populus euramericana) in reclaimed land was investigated. The stduy plot were established with two tillage levels and three soil additive levels: control(till 20cm, additives 0kg), T1(20cm, 4kg), T3(40cm, 8kg); each soil amendment treatments can be divided by two fertilization treatment(N: non-ferilized, F: ferilized). The first year after soil amendment treatments, NaCl and EC decreased compared to pre-treatment; however, there were no differences among the four treatments. The organic matter, total nitrogen and available phosphorus measured 3years after treatments, significantly increased compared to control while EC and NaCl notably lowered than control. Especially, EC in all treatments except the control was within the optimum range of tree growth(below 0.4dS/m). In terms of fertilization, chlorophyll concentration(SPAD) and biomass productivity in fertilization treatment were hight than no-fertilized treatment. The PCA analysis was performed to examine the relationship between soil abiotic properties and poplar growth each at the initial stage(rootage) and after rootage. The PCA analysis indicated that the major factor for poplar growth each at the initial stage was soil physical properties which play an important role in the early root development. After root development, soil pH and NaCl in the soil were the major growth inhibitory factors. This findings confirmed that the essential conditions for the efficient production of the wood energy feedstock in the reclaimed land were soil physical properties at the initial stage of (Populus euramericana) (before rootage) but soil chemical properties became important at the lateralstage of (Populus euramericana). Keywords: Adaptive and integrated management, Climate change, Economic Development ID: 3622988 -
DocumentSpatial distributions pattern and associations of dead woods in natural spruce-fir secondary forests
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Natural secondary forest is the main part of forest resources in China. Studying dead woods (DW) could better reveal the community succession rule and promote the healthy development of them. We investigated basic characteristics and coordinates of each tree (DBH≥1 cm) within a plot (100 m×100 m) using the adjacent grid method and studied the spatial distributions pattern and associations of DW (in the last five years) in a typical natural spruce-fir secondary forest in Jingouling Forest Farm, Wangqing Forestry Bureau, Jilin Province, China. The results showed that the diameter class distribution of DW showed the pattern of left-single-peak curve, while the logs showed the pattern of multi-peak curve. DW number was related to the mixing degree of one species, but not to the total number of it. The distribution of DW was concentrated at 0~8m scale. As the scale increases, it changed to random or uniform. The aggregation distribution of DW of medium (10 cm≤DBH<20 cm) and small (1 cm≤DBH<10 cm) DBH at small scale below 8 m was the main reason for the aggregation distribution of DW. The DW of large (DBH≧20 cm) DBH and Saplings (1 cm≤DBH<5 cm) showed a significant positive association at 2~25 m scale. There was no significant spatial association between DW and Small trees(5 cm≤DBH<15 cm). At 0~3m scale, there was a positive association between Medium trees (15 cm≤DBH<25 cm) and DW of small and medium DBH. At the 9 m, 11~14 m scale and the 15 m, 42~45 m scale, the DW of small and medium DBH were significantly negatively associated with Large trees (DBH≥25 cm). In conclusion, the biological traits, diameter class distribution and spatial distribution affected the abundance and diameter class distribution of DW of one species. The spatial distributions of DW and the associations between DW and standing trees varied across diameter classes and scales. Rational utilization of spatial information could optimize stand structure and promote positive community succession. Keywords: Deforestation and forest degradation, Sustainable forest management, Adaptive and integrated management ID: 3618474
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